Was Ivan the Terrible the first czar?
An interesting details you might want to add in your homework is that Ivan IV of Russia (Ivan the Terrible) father was Ivan III who was married with Zoe Palaiologos (also known as Sophia Palaiologina) who was the last descendant of the last Byzantine Emperor. The Tzars were craving to assume the Byzantine power (wanted to be called 3rd Rome) so it was crucial for them to have Imperial blood in the family.